Improvement in hoisting apparatus



2 SheetsnShee Patened March 26, 1872.

N. S. McFARLAN D.

Improvement in Hoistng Apparatus.

l//fzaessea .Y uw MM zsh --sh 2.. N. S. MCFARLAND. Nee e VImprovement inHoistir'g Apparatus.` N0.125,06, A l PatentedlVlarch26J872.

' AM f/faTai/THomAF/flr c@ my. lasso/mdr macrm/ L M K UNITED STATESPATENT OFFICE.

IMPROVEMENT IN HOISTING APPARATUS.

Specification forming part of Letters Patent No. 125,064, dated March26, 1872.

Specification describing certain new and use ful Improvements inHoisting Apparatus, the

invention of NATHANIEL S. MCFARLAND, of the city of Brooklyn, in thecounty of Kings and State of N ew York.

This invention relates more particularly to double hoist-ways in whichtwo cars are arranged to travel in reverse directions simultaneously,and connected so that the one car counterbalances and operates the otherby means of chain with which either car alternately is loaded. Theinvention consists in various novel combinations and arrangements ofparts, whereby great eciency and other advantages are obtained for saidhoisting apparatus, and the cars are made to travel with an acceleratedvelocity. The invention also includes a novel and advantageousconstruction of brake for arresting the motion of either ear by clampingor clipping the opposite sides ofthe guides up and down which the cartravels.

In the accompanying drawing which forms part of this specification,Figure l represents a side elevation of a double hoist-way or twohoist-ways arranged side by side, with my improvements in hoistingmechanism applied thereto; Fig. 2, a vertical section of the same at theline .r w,- Fig. 3, a sectional side elevation thereof; and Fig. 4, avertical section at the line y y. Fig. 5 is a horizontal section throughone of the hoisting-cars, showing a certain description of brakemechanism for checking or arresting the motion ofthe car at any desiredpoint in its travel.

Similar letters of reference indicate corresponding parts throughout theseveral figures of the drawing.

A A' represent a double hoistway or two hoist-ways arrangedside by side.B B' are two cars fitted to travel up and down said hoist-ways, andconnected to work simultaneously in reverse directions, as by ropes orchains b b, arranged to pass over pulleys C O of a free or independentshaft, c, situated at top of the duplicated hoist-way. D E and D' E' areupper and lower pulleys arranged above and below said hoist-way onopposite sides of it. Endless chains, belts, or ropes d d' are passedaround each pair of .upper and lower pulleys D E D' E' for the purposeof operating the upper pulleys D D when required by pulling on the ropesd d'. On the shafts of the upper pulleys D D' are spur-gears F F', whichgear with pinions G G on upper cross-shafts e e', when it is required torevolve the latter, but not at other times. For this purpose the shaftse e' are hung in swin ging frames or hangers H H', having their fulcrumsat ff', so that by drawing the hangers toward each other the pinions GG' are thrown out of gear with the wheels F F', and on reversing themovement of the hangers said pinions and wheels are put into gear. Thefulcrums of these hangers are so arranged that the latter by theirweight serve to throw and keep the pinions G G' in gear with the wheelsF F'. Upon the shafts e e' of the pinions G G' are spur-wheels I I',which, when the pinions G G' are thrown out of gear with the wheels F F'by swinging the hangers H H' toward each other, gear with anintermediate wheel, J, fast on the shaftc; but when the swinging framesH H' are allowed to return or drop so as to put the pinions G G' in gearwith the wheels F F', then the wheels I l' are thrown out of gear withthe intermediate wheel J. This last-mentioned wheel is of greaterdiameter than the wheels I I' for a purpose that will be hereinafterdescribed. Upon the shafts e e' are also arranged fast chainwheels orpulleys K K', over which independent loose chains L L' are passed, saidchains passing from stationary chain-boxes M M on the side of eitherhoist-way at their tops to chain-chambers g g', in or on the cars B B',for the purpose of loading either one of said cars with chain when it isrequired to lower it and elevate the other car. Either car is loadedwith its chain L or L', as required, by suitably pulling on the rope dor d', controlling the pulleyD or D', wheel F or F', pinion G or G', andchain-pulley Kor K'.

- The swinging frames or hangers H H are operated as follows: Arrangedabove the hoistways, and intermediate of them, is a cross shaft, h,which is connected on opposite sides of its axis by chains or otherconnections i with the swinging frames H H. On this shaft is a toothedcatch or holder, N, into which, when suitablyturned or adjusted alongwith its shaft, a toothed pawl, O, drops or bites for the purpose ofholding the shaft h in its turned position. When the shaft h is thusturned and locked the swinging frames H H' are drawn and held towardeach other, and the wheels I I' and J placed in gear with each other.'Upon' lit'tin g the paw] 0 out of lock with the-catch or holder N, thenthe shaft h is released and the swinging frames or hangers H H' fallback by their weight, turning said shaft and the catch N in a reversedirection, and putting the wheels I I' out of gear with the wheel J, andthepinions G G' into gear with the wheels F F'. The pawl O is raisedwhen it is required to put it out of lock with the catch N by pulling ona rope or chain, k, attached to the one end of a pawllifter, P, that mayhe a lever having an intermediate fulcrum. The rope 7c is extended downbetween the hoist-ways within reach of the operator in either cab, andis secured at the bottom ot' the structure. Another similarly arrangedrope, l, is secured at the bottom ot' the struct-ure, and at its otherend to the catch N, so that by pulling on said rope the shaft h issuitably turned to bring the wheels I I' and J in gear, andI catch Ninto position for the pawl O to drop into lock with it. To insure thepawl thus dropping, when required, and prevent failure thereof by theweight of the rope 7c holding up the pawl-lifter so as to interfere withthe dropping of the pawl, the rope Z is provided with a knot orprojection, m, which, on being Y depressed with the rope, catches on thepawllifter P and drops or lowers it out of the way ofthe pawl.

, The cars B B' are each provided with a brake for arresting its motionat any desired point in its travel, as when required to stop at anyparticular iioor in a building, or under other circumstances. This brakeR consists of gripers or levers n n workingon vertical pivots o o, andarranged to clip opposite sides ofthe guides p p, up and down which thecar travels, so that said gripers exert no tendency to strain on theguides or force them away from each other. These levers or gripers aremade to clip or y press in opposite directions on the sides ofthe guideswith any desired force by power applied to alever, q, which is inslotted connection with a sliding` plate, r. This plate has obliqueslots s s, within which pins projecting from the levers 'n n t, so thatby sliding the plate r in a given direction said levers or gripers aremade to clamp the sides ot' the guides bythe combined action ofthe leverq andoblique slots s s, and power is communicated to said lever toeli'ect the clip by a rope or chain, t, accordinglyT as the same iswound on a barrel or windlass, u, through cra-nk or handle appliedthereto. A pawl, o, and ratchet w serve to hold the barrel u at anydesired point to secure a given hold ofthe brake, or to release it whenrequired, by throwing the pawl o out of contact with the ratchet, when aspring, z, pulls on the lever q to throw back the gripers. By means ofthe obliquely-slotted slide or plate 1*, in combination with themechanism for operating it, the` brake is brought into action by acombined lever and wedge-like force7 which gives a gradual and powerfulhold on the guides.

In the operation of the apparatus the loaded car to be elevated is setin motion by pulling on the rope or chain d or d', so as to pay outchain L or L' from the one chain-box M or M' into the chamber g or g ofthe previously-elevated car till the weight of said chain overcomes thatof the loaded car. To ett'ect this the pawl O is first pnt out of gearwith the catch N, so that the pinions G G' are in gear with the wheels FF'. The operator then pulls upon the rope l to put the catch N in gearwith the pawl O, and wheels I I' in gear with the wheel J, when theloaded car begins to ascend under the weight of the chain in the othercar and the cars are caused to travel in reverse directions, the oneascending and the other descending, simultaneously with an acceleratedvelocity byreason ofthe difference in diameters of the wheel J andwheels I I' which causes the one drum K or K' to pay out chain and theother of said drums to pick up chain faster than the cars travel, sothat it is only necessary to pay out by hand through the rope d or d' asmuch chain at first as is necessary to overcome friction and equilibriumofthe cars in order to procure a starting torce and the acceleratedmotion afterward acquired by constantly adding chain to that alrea dy inthe one car and diminishing from the quantity in the other car will givean et'ective power to overcome any resistance in the hoist-ways.

What is here claimed, and desired to be secured by Letters Patent, is-

1. 'Ihe combination ofthe chain-boxes M M', the chains L L', andchain-pulleys K K' with the cars B B', wheels or pulleys C C, and ropesor chains b b, when arranged for operation, substantially as described.

2. The combination ot thediierential gear I I' and J with the chains LL', the chain-pul leys K K', thecars B B', the wheels or pulleys C C,and ropes or chains b b, essentially as speciiied.

3. The swinging fra-mes or hangers H H', in

combination with the pinions G G', the wheels I l', the wheel J on theshat't c of the pulleys over which the car-ropes travel, the wheels FF', the pulleys D E D' E', and ropes or chains d d', substantially asspecified.

4. The combination ofthe catch N and rope l with the pawl O, theconnections i i, and the swinging frames or hangers H H', essentially asdescribed. v

5. The knot or projection m on the rope l, in combination with thepawllifter P and rope or cha-in 7c, substantially as speciiied.

6. The brake It, when constructed and arranged tor operation in relationwith the guides p p of the hoist-way, essentially as described.

' N. S. MCFARLAND.

Witnesses FRED. HAYNES, W. MORRIS SMITH.

